Knife-sharpener for cloth-cutting machines and the like.



F. L. ROOT.

KNIFE SHARPENER FOR CLOTH CUTTING MACHINES AND THE LIKE.

APPLICATION FILED NOV- 22. I915- Patented June 20,1916.

IN I/E/I/TOR ,4 TTORNEIS MIA??? /M 1 WM the racks an UNITED STATES PATENT OFFICE.

FRANK L. ROOT, OF NEW YORK, N. Y., ASSIGNOR 'IO H. MAIMIN COMPANY, INC., OF NEW. YORK, N. Y., A CORPORATION OF NEW YORK.

KNIFE-SEARPENER FOR CLOTH-CUTTING- MACHINES AND THE LIKE.

Specification of Letters latent.

Patented June 20, 1916.

To all whom it may concern:

Be it known that I, FRANK L. Roo'r, a citizen of the United States, and resident of the city, county, and State of New York, have invented certain new and useful Improvements in Knife-Sharpeners for Cloth- Cutting Machines and the like; and I do hereby declare the following to be' a full, clear, and exact description of the invention, such as will enable others .skilledin the art to which it appertains to make and use the a same.

The invention relates to knife sharpening attachments for cloth-cutting machines of the type disclosed in my co-pending application for United States Letters Patent Serial No. 61,261, filed November 13, 1915, and its purpose is to simplify and improve the construction and operation of the grindstones and their attachment to the reciproeating carrier.

In the drawings, Figure 1 shows the knife sharpening attachment in side elevation fastened to a cloth-cutting machine; Fig. 2 shows the same parts in front elevation; Fig. 3 is a side elevation of the carrier on a somewhat larger scale; Fig. 4. is a section on the line 4-4 of Fig. 5; Fig. 5 is a section on the line 5-5 of Fig. 3; and Fig. 6 is a section on the line 6-6 of Fig. 4.

The guide rack 1 is adapted to be supported, by the elbow lever 2, pivoted to the arm 3, in grinding relation to the edge of the knife, and to be stopped in that position by the adjustable foot 4 as shown in Fig. 1. The guide rack passes centrally through the carrier 5 and has rack teeth on both of its faces, as shown. In the carrier are mounted the two stub shafts 6, carrying the grindstones 7 and the pinions 8 meshing with the two series of rack teeth on the two sides of the guide rack 1. The stub shafts are set in the carrier at an angle to the longitudinal axis of the guide rack, so that the stones will extend angularly lengthwise of the knife, as shown in Fig. 1. The axes of thestub shafts lie in lanes parallel to the faces of d parallel" to the blade of the knife, and in order to give the proper inclination' of the grinding surfaces, with the stub shafts so located, the grindstones are a coned to present grinding surfaces which extend outwardly from the plane of the knife as shown. t

The arrangement described affords a compact and inexpensive arrangement of the rack teeth and the stub shafts and pinions, and it permits the grindstones to be set one above another, and at the proper angle, as is necessary to produce the desired grinding effect, While at the same time avoiding an undue extension of the length of the carrier. This is an important feature, because in cloth-cutting machines of the type in question the upward movement of the knife blade is limited and it is necessary that the grindstones should be so mounted that they may be brought, on the down-stroke, to the lower extremity of the knife. The arrangement of parts, in this respect, is illustrated in Fig. 1.

It will be understood that, although I prefer to use the grinder as shownin the drawings, so that it Will produce an upcutting edge on the knife, yet it is possible, by removing the carrier and reversing it, to provide for the grinding of a downcutting edge on the knife in cases where that may be desirable.

lVhat I claim is:

1. A knife-sharpening grinder for the purpose described, comprising a guide, a carrier reciprocable on the guide, stub shafts rotatably mounted on the carrier, grindstones on the stub shafts, and cooperating driving means on the guide andstub shafts for rotating the stub shafts and grindstones as the carrier is reciprocated 011 the'guide, the axes of said stones extending angular-1y lengthwise of the guide in planes substantially parallel to the plane of the knife and the surfaces of the grindstones being coned to extend at an angle outwardly from the plane of the knife.v

2. A knife sharpening grinder for the purpose described, comprising a guide rack, a carrier reciprocable on the guide rack, stub shafts rotatably mounted in the carrier, grindstones on the stub shafts and pinions; on the stub shafts meshing with the rack, the axes of the stub shafts extending angu larly lengthwise of theguidein planes substantially parallel to thevplane of the knife, and the surfaeesj of the grindstones: beings coned to extend at an angle outwardly from the plane of the knife.

3. A knife sharpening grinder for the purpose deseribed having a centrally located double guide rack, a carrier reeiprocable on the guide rack, stub shafts rotatably mounting with the two faces of said double rack, 10

the axes of the stub shafts extending angularly lengthwise of the guide in planes substantially parallel to the plane of the knife and the surfaces of the grindstones being coned to'extend at an angle outwardly from 15 the plane of the knife.

In testimony whereof I aifix my signature.

' FRANK L. ROOT. 

